### Statistical Mechanics

(mechanical behavior based upon probability)

**Statistical Mechanics** is the mechanical behavior of
a system whose detailed state is unknown, but for which
an overall (non-detailed) state can be derived through
mathematical probability.

Likely, the original physics problem for which Statistical Mechanics
was developed is the behavior of gases, e.g., **Boyle's Law** or the
**Ideal Gas Law**, modeled as the highly probable result of the
interaction of many molecules. Given the large number of molecules
in everyday systems (e.g., the air in a room), the "probable" behavior
is so probable as to be virtually determined.

Statistical Mechanics was worked out using **Classical Mechanics**
but has been adapted to Quantum Mechanics.

(*physics,mechanics*)
http://en.wikipedia.org/wiki/Statistical_mechanics

**Referenced by:**

Hamiltonian

Partition Function (Z)

Thermodynamics

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